Study on the Sensitivity of Controllable Parameters in an Active Vibration Isolation System of Air Spring With Rubber Bellow

2005 ◽  
Author(s):  
Chang-Geng Shuai ◽  
Lin He ◽  
Zhi-Qiang Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Vibration Isolation ◽  
Vertical Displacement ◽  
Control Parameters ◽  
Air Spring ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Vertical Stiffness ◽  
Active Vibration

The characteristics of control parameters of air spring with rubber bellow are analyzed through finite element method and thermodynamic equation respectively. The analysis results indicate that the vertical stiffness of air spring is sensitive to the varying of vertical displacement and volume, and nonlinearly varies with vertical displacement. When the air spring is pressed down or pulled up under the exterior excitation, the height of air spring can be controlled to keep stable through adjusting the volume of air spring by the use of hydraulic transformer.

Research of Novel Hybrid-Electromagnetic Actuator with Adjustable Rigidity and Damping

2010 ◽  
Vol 43 ◽  
pp. 448-452
Author(s):  
Wei Guang Wu ◽  
Lv Zhong Ma
Keyword(s):  
Finite Element ◽  
Vibration Isolation ◽  
Magnetic Circuit ◽  
Active Vibration Control ◽  
Electromagnetic Actuator ◽  
Structure Parameters ◽  
Current Direction ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Active Vibration

A novel hybrid-electromagnetic actuator with the permanent magnet is designed, by which the operating component can realize the to-and-fro driving movement by changing the current direction of its control coil and it is more convenient to use for active vibration control. The electromagnetic force of the actuator is theoretically calculated by equivalent magnetic circuit and by the finite element respectively. Finally the characteristic of its rigidity and damping in an active vibration isolation system are analyzed, and it is indicated that they are not only related to its structure parameters，but also to the parameter of controller.

scholarly journals Analysis of Vertical Stiffness of Air Spring Based on Finite Element Method

2018 ◽  
Vol 153 ◽  
pp. 06006
Author(s):  
Jiatong Ye ◽  
Hua Huang ◽  
Chenchen He ◽  
Guangyuan Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Element Model ◽  
Simulation Method ◽  
Bench Test ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Element Simulation ◽  
Element Method

In this paper, a finite element model of membrane air spring in the vehicle is established, and its vertical stiffness characteristics under a certain inflation pressure are analysed. The result of finite element simulation method is compared with the result of the air spring bench test. The accuracy and reliability of the finite element simulation method in nonlinear analysis of air spring system are verified. In addition, according to the finite element method, the influence of the installation of the air spring limit sleeve on its stiffness is verified.

Development of Vibration Isolator With Controllable Stiffness Using Permanent Magnets and Coils

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
Kai Meng ◽  
Yi Sun ◽  
Huayan Pu ◽  
Jun Luo ◽  
Shujin Yuan ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Vibration Isolation ◽  
Permanent Magnets ◽  
Negative Stiffness ◽  
Vibration Isolator ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Stealth Technology ◽  
Active Vibration ◽  
Magnetic Rings

In this study, a novel vibration isolator is presented. The presented isolator possesses the controllable stiffness and can be employed in vibration isolation at a low-resonance frequency. The controllable stiffness of the isolator is obtained by manipulating the negative stiffness-based current in a system with a positive and a negative stiffness in parallel. By using an electromagnetic device consisting of permanent magnetic rings and coils, the designed isolator shows that the stiffness can be manipulated as needed and the operational stiffness range is large in vibration isolation. We experimentally demonstrate that the modeling of controllable stiffness and the approximation of the negative stiffness expressions are effective for controlling the resonance frequency and the transmissibility of the vibration isolation system, enhancing applications such as warship stealth technology, vehicles suspension system, and active vibration isolator.

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